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The phase angle lead characteristic and the amplitude attenuation characteristic of the lag network can be used to improve the performance of the lead and lag corrector system. Therefore, for the stability of Electric Power Steering (EPS) system, an optimization scheme based on lead and lag corrector is proposed. Firstly, the state space equation of EPS system is established based on the steering system dynamics theory and the system transfer function is obtained. Secondly, the open loop transfer function is derived based on the system transfer function, and the influence of the lead and lag corrector on the stability of EPS system is analyzed by simulation. Finally, forward development and design are deployed for lead and lag parameters development. The results show that the amplitude margin, phase Angle margin and cutoff frequency of the open loop transfer function after correction are obviously improved compared with that before correction, and the designed lead lag corrector can greatly improve the stability of EPS system.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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